Abstract
Background
Shikonin is a natural multipotent anti-tumorigenic compound. We investigated potential synergy between shikonin and anti-diabetic metformin against tumorigenic properties of breast cancer cell line MCF-7.
Methods and results
The IC50 of shikonin and metformin was determined after a single treatment of two cell lines MCF-7 and MDA-MB-231. We then measured optimal doses of each drug, used in combination, in MCF-7 cells. These sub-IC50 doses were co-applied for all subsequent combined treatments to evaluate their synergistic effects on MCF-7 tumorigenic properties. Next, we examined expression levels of the genes crucial for apoptosis, cell growth, and EMT using RT-PCR or real-time PCR and monitored CD44/CD24 ratios using flow cytometry. Binding energies between shikonin and growth molecules were measured by in silico simulation.
Shikonin caused significantly reduced cell survival that was accelerated by the synergizing presence of metformin. Drug combination induced apoptosis and ROS levels while fully blocking cell migration and reverting EMT. RT-PCR showed strong suppression of BCL-2 but induction of BAX and PTEN. Prolonged shikonin treatment caused a total loss of the nuclear membrane, whereas metformin prevented this damage while promoting apoptotic morphologies. Our real-time PCR detected reduced levels of EMT genes but increases in the anti-EMT gene CDH1. Combined treatment also reduced CD44/CD24 ratios in favor of chemosensitivity. Binding energies strongly favored shikonin interactions with growth-signaling molecules.
Conclusions
Shikonin and metformin synergize in inhibiting the tumorigenic activities of MCF-7 cells including their proliferation, invasiveness, and EMT with a potential to inhibit multidrug resistance.
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Data availability
Any materials and data are available from the corresponding author on reasonable request.
Code availability
Not applicable.
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This study was financially supported by a grant from National Institute of Genetic Engineering and Biotechnology (NIGEB) (Grant 589).
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ART carried out most of the experiments. PG designed and implemented a part of experiments including invasion and cell co-staining plus molecular docking. FS contributed to the dose determination of shikonin and metformin as well as editing and reviewing the manuscript. MG was a grantee of the project, supervised the first author, and designed the whole structure of the manuscript in detail.
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Tabari, A.R., Gavidel, P., Sabouni, F. et al. Synergy between sublethal doses of shikonin and metformin fully inhibits breast cancer cell migration and reverses epithelial-mesenchymal transition. Mol Biol Rep 49, 4307–4319 (2022). https://doi.org/10.1007/s11033-022-07265-9
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DOI: https://doi.org/10.1007/s11033-022-07265-9